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R3.56
The BC 547 Transistor is a bipolar junction transistor (BJT) NPN-Type and is often used to drive relays or LED drivers when used as a switch but is also widely used to amplify signals.
NPN
BC 547 NPN Transistor (Switch & Amplification)
BC337 General-Use PNP Transistor (Switch)
R1.20
BC547b General-Use NPN Transistor (Amplifier)
R1.25
BC547c General-Use Transistor (Amplifier)